中海淡水化過程における塩分拡散機構(第2報) : 湖底摩擦係数の推定

島根農科大学研究報告 Volume 15 Page (A-4)8-13- published_at 1967-01-31
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Title
中海淡水化過程における塩分拡散機構(第2報) : 湖底摩擦係数の推定
Title
Studies on the Mechanism of the Saliinity Diffusion in Nakaumi Sea, Shimane Prefecture(II) : On the Estimation of the Bottom Friction Coefficient
Title Transcription
ナカウミ タンスイカ カテイ ニオケル エンブン カクサン キコウ ダイ2ホウ コテイ マサツ ケイスウ ノ スイテイ
Creator
Fukuma Jun
Source Title
島根農科大学研究報告
Volume 15
Start Page (A-4)8-13
Journal Identifire
ISSN 05598311
Descriptions
One of the nlost important problems in the hydraulic model test to investigate lake current variation is how to assume the value of the bottom friction coeficient defilned by C_f=τ_b/ρU^2_b in which τb is shearing stress acorss the bottom, ρ density of fluid and U_b bottom velocity of flow. Several methods to estimate C_f, wave spectrum method, significant wave method were proposed, but for the lack of data it is impossible to apply the methods mentioned to the case of Nakaumi Sea. In this paper, from shearing stress caused by wind on the water surface and hydraulic gradient observed on Shinji Lake, the value of C_f is quantatively estimated on the assumption that the hydraulic pecurialities of Shinji Lake can be regarded as similar to that of Nakaumi Sea for the limited purpose of the investigation of the lake current variation. The values of C_f obtained ranges from 2 × <10>^<-3> to 24 × <10>^<-3> (C.G.S) and the mean value of C_f is nearly 7 × <10>^<-3> (C.G.S). It should be noticed that these values of C_f are nearly equal to the values generally expected and no correlation between C_f and wind velocity W is recognized so far as the results obtained up to the present are considered. Some suggestions to the future studies are given by the author's trial calculations.
Language
jpn
Resource Type departmental bulletin paper
Publisher
島根農科大学
The Shimane Agricultural College
Date of Issued 1967-01-31
Access Rights open access
Relation
[NCID] AN00108241
Remark A,Bを含む